Question

The depletion region of p-n junction

• A. increases if reverse biased.
• B. increases if forward biased.
• C. decreases if reverse biased.
• D. remains same in reverse and forward biasing.

Hint:

Reverse bias pulls charge carriers away from the junction, so the depletion region widens.

Answer 1

The Correct Option is A

Step 1: Approach
Follow the carriers.

Step 2: Reverse
The applied field points the same way as the junction's built-in field. It sweeps holes and electrons away from the junction, which widens the bare layer of ions.

Step 3: Forward
The applied field opposes the built-in field, so the layer narrows.

Step 4: Answer
The depletion region increases under reverse bias, option (A).

Final Answer:
Reverse bias pulls carriers away from the junction and widens the depletion region, option (A). \[ \boxed{\text{Increases if reverse biased}} \]